"Terrorism": the most meaningless, manipulated, and destructive word in our political lexicon
DEFINITION:
Terrorism, noun: 1. things that are bad; 2. things I don't like
The entire concept of a "Terrorism expert" is invalid, as it is an honorific title typically assigned due to ideology and interests served rather than actual expertise.
In U.S. political and media discourse, Terrorism means little more than: that which America's Enemies du Jour (generally Muslim Enemies) do to it, but not what America and its allies do to anyone.
Terrorism is not a real concept in which one develops "expertise"; it is, and from its introduction into world affairs always has been, a term of propaganda designed to legitimize violence by some actors while delegitimizing very similar violence by others.